Fix a few documentation typos I noticed.
Fix a few documentation typos I noticed.

joergdietrich/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,tbabej/astropy,larrybradley/astropy,dhomeier/astropy,tbabej/astropy,dhomeier/astropy,dhomeier/astropy,bsipocz/astropy,StuartLittlefair/astropy,saimn/astropy,astropy/astropy,DougBurke/astropy,stargaser/astropy,pllim/astropy,pllim/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,lpsinger/astropy,larrybradley/astropy,pllim/astropy,AustereCuriosity/astropy,DougBurke/astropy,mhvk/astropy,stargaser/astropy,tbabej/astropy,joergdietrich/astropy,MSeifert04/astropy,kelle/astropy,saimn/astropy,funbaker/astropy,tbabej/astropy,saimn/astropy,kelle/astropy,tbabej/astropy,StuartLittlefair/astropy,AustereCuriosity/astropy,astropy/astropy,DougBurke/astropy,saimn/astropy,larrybradley/astropy,larrybradley/astropy,funbaker/astropy,joergdietrich/astropy,kelle/astropy,lpsinger/astropy,mhvk/astropy,lpsinger/astropy,lpsinger/astropy,bsipocz/astropy,stargaser/astropy,aleksandr-bakanov/astropy,pllim/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,mhvk/astropy,joergdietrich/astropy,astropy/astropy,DougBurke/astropy,MSeifert04/astropy,dhomeier/astropy,StuartLittlefair/astropy,kelle/astropy,bsipocz/astropy,MSeifert04/astropy,joergdietrich/astropy,saimn/astropy,pllim/astropy,funbaker/astropy,dhomeier/astropy,AustereCuriosity/astropy,mhvk/astropy,astropy/astropy,AustereCuriosity/astropy,mhvk/astropy,kelle/astropy,funbaker/astropy,lpsinger/astropy,stargaser/astropy,bsipocz/astropy,MSeifert04/astropy,astropy/astropy,AustereCuriosity/astropy